Manufacturing tolerances

The production of printed circuit boards is carried out according to the valid IPC guidelines and standards and on the basis of following technical specifications. HDI or MFT boards can be produced with smaller tolerances. Differing requirements of the customer must be explicitly agreed!

Pattern tolerances

The hole pattern for vias (DK) goes through all the layers of the circuit and therefore serves as a location reference for the other patterns.

Type Tolerance
TypeDrilling pattern (PTH) to conductive pattern outer layersTolerance±0,10mm
TypeDrilling pattern (PTH) to conductive pattern inner layers Tolerance±0,15mm
TypeDrilling pattern (PTH) to milling pattern / contourTolerance±0,10mm
TypeDrilling pattern (NPTH) to milling pattern / contourTolerance±0,10mm
TypeDrilling pattern (PTH) to marking printTolerance±0,15mm
Type Tolerance 
TypeConductive pattern to solder resistTolerance±0,10mm
TypeConductive pattern to marking printTolerance±0,20mm
Type Tolerance 
TypeHole to hole, one pass* (PTH-PTH or NPTH-NPTH)Tolerance±0,05mm
TypeHole to hole, two passes (PTH-NPTH)Tolerance±0,10mm

* Also applies for PTH-NPTH if they are drilled in one run (e.g. location holes for SMD stencils).

Vias & Drills

Type Surface Final-Ø
TypePlated-through-holes (PTH) and component holesSurfaceHAL surfaceFinal-ر0,10mm
Type Surfacechem. surface Final-ر0,05mm
TypeNon-plated-through-holes (NPTH)Surface-Final-ر0,08mm

Cu thickness in vias

Via type Class 2 (standard) class 3
Via typeVia (> 150µm)Class 2 (standard)min. 20µm - 25µmclass 3min. 20µm - 25µm
Via typeMicrovia (≤ 150µm)Class 2 (standard)min. 18µm - 20µmclass 3min. 20µm - 25µm
Via typeBlind ViaClass 2 (standard)min. 10µm - 12µmclass 3min. 10µm - 12µm
Via typeBuried ViaClass 2 (standard)min. 10µm - 12µmclass 3min. 10µm - 12µm

Conductor

Type Tolerance Reference
TypeConductor width*Tolerancemin. 80%Referencein comparsion to the data
TypeConductor space*Tolerancemax. 30% reduction (standard)Referencein comparsion to the data

*acc. to IPC-6012C

Impedance control

Type Tolerance Mode
TypeImpedance controlTolerance 10%Modenormal
TypeImpedance controlTolerance 5%Modeextended

Milling

Type Tolerance
TypeMilling offsetTolerance±0,10mm
TypeZ-Axis milling depthTolerance±0,20mm

Scoring

Type Tolerance
TypeOffset (to PCB center)Tolerance±0,10mm
TypeDrilling pattern (PTH) to scoring patternTolerance±0,15mm
TypeDrilling pattern (NPTH) to scoring patternTolerance±0,20mm
TypePCB dimension x/yTolerance±0,15mm
TypeScoring depthTolerance±0,20mm

Base material - rigid PCBs

Type Tolerance
TypeBase material thicknessTolerance±10%

The information about the base material thickness exclusively defines the thickness of the dielectric including base copper. The other layer structures such as electroplated Cu layers or solder resist layers result in increased final thickness.

Base material - flexible PCBs

Type Tolerance
TypeDielectric thickness ≥ 0,075mmTolerance±10%
Type0,025mm ≤ Dielectric thickness ≥ 0,075mmTolerance±10%
Type0,020mm ≤ Dielectric thickness ≥ 0,025mmTolerance±12,5%
TypeDielectric thickness < 0,020mmTolerance±15%
Type Tolerance 
TypeAdhesive thickness ≥ 0,075mmTolerance±10%
Type0,025mm ≤ Adhesive thickness ≥ 0,075mmTolerance±15%
Type0,020mm ≤ Adhesive thickness ≥ 0,025mmTolerance±20%
TypeAdhesive thickness < 0,020mmTolerance±30%
TypeFor woven or combinations with woven stiffener:
Adhesive thickness ≥ 0,025mm
Tolerance±20%

Specifications according to IPC-4204A. The information on the thickness of the base material defines solely the dielectric thickness or adhesive thickness incl. base copper. The other layer structures such as e.g. galvanic Cu or solder-stop lead to an increased circuit final thickness.

Rigid PCB thickness

Type Tolerance
TypeProducibility level B (standard)ToleranceThe higher value of ±10% or ±178µm

Thickness tolerances for pressed multilayers according to IPC-2222A. When measured over metallizations or coatings, those thicknesses and tolerances must be considered.

Flexible PCB thickness

Type Tolerance
TypeFlexible part thickness Tolerance±50µm
TypeFlexible part + stiffener thickness Tolerance±100µm

Bow & Twist

For PCBs ≥ 0,8mm thickness Tolerance
For PCBs ≥ 0,8mm thicknesswith SMDTolerance0,75%
For PCBs ≥ 0,8mm thicknesswithout SMDTolerance1,50%

Please note that the twist & bow value is increased above average, if the copper balance of the PCB is locally very unequal or if the circuit board is very thin.

Surfaces

Surface PCB RoHS-compliantRoHS-compliant PCB solderingSoldering PCB Bonding aluminium wireBonding aluminium wire PCB Bonding gold wireBonding gold wire PCB BGABGA PCB Flex-/Rigid-FlexFlex-/Rigid-Flex PCB PressfitPressfit PCB PCI contactsPCI contacts PCB sliding contactSliding contact PCB surface thicknessThickness PCB shelf lifeShelf life PCB Reflow CyclesReflow Cycles
SurfaceHal SnPbPCB RoHS-compliantRoHS-compliant PCB solderingSolderingcheckPCB Bonding aluminium wireBonding aluminium wire PCB Bonding gold wireBonding gold wire PCB BGABGA PCB Flex-/Rigid-FlexFlex-/Rigid-Flex PCB PressfitPressfitcheckPCB PCI contactsPCI contacts PCB sliding contactSliding contact PCB surface thicknessThickness>5µmPCB shelf lifeShelf lifeca.12 monthsPCB Reflow CyclesReflow Cycles5
SurfaceHAL lead-freePCB RoHS-compliantRoHS-compliantcheckPCB solderingSolderingcheckPCB Bonding aluminium wireBonding aluminium wire PCB Bonding gold wireBonding gold wire PCB BGABGA PCB Flex-/Rigid-FlexFlex-/Rigid-Flex PCB PressfitPressfitcheckPCB PCI contactsPCI contacts PCB sliding contactSliding contact PCB surface thicknessThickness>5µmPCB shelf lifeShelf lifeca. 12 monthsPCB Reflow CyclesReflow Cycles5
SurfaceChemical tinPCB RoHS-compliantRoHS-compliantcheckPCB solderingSolderingcheckPCB Bonding aluminium wireBonding aluminium wire PCB Bonding gold wireBonding gold wire PCB BGABGA PCB Flex-/Rigid-FlexFlex-/Rigid-Flex PCB PressfitPressfitcheckPCB PCI contactsPCI contacts PCB sliding contactSliding contact PCB surface thicknessThickness>1µmPCB shelf lifeShelf lifeca. 6 monthsPCB Reflow CyclesReflow Cycles5
SurfaceChemical silverPCB RoHS-compliantRoHS-compliantcheckPCB solderingSolderingcheckPCB Bonding aluminium wireBonding aluminium wirecheckPCB Bonding gold wireBonding gold wire PCB BGABGA PCB Flex-/Rigid-FlexFlex-/Rigid-Flex PCB PressfitPressfitcheckPCB PCI contactsPCI contacts PCB sliding contactSliding contact PCB surface thicknessThickness0.2 - 0.3µmPCB shelf lifeShelf lifeca. 12 MonatePCB Reflow CyclesReflow Cycles5
SurfaceChemical gold
ENIG
PCB RoHS-compliantRoHS-compliantcheckPCB solderingSolderingcheckPCB Bonding aluminium wireBonding aluminium wirecheckPCB Bonding gold wireBonding gold wire PCB BGABGAcheckPCB Flex-/Rigid-FlexFlex-/Rigid-FlexcheckPCB PressfitPressfitcheckPCB PCI contactsPCI contacts PCB sliding contactSliding contact PCB surface thicknessThickness3-6µm Ni
0.025-0.1µm Au
PCB shelf lifeShelf lifeca. 12 monthsPCB Reflow CyclesReflow Cycles5
SurfaceENEPIGPCB RoHS-compliantRoHS-compliantcheckPCB solderingSolderingcheckPCB Bonding aluminium wireBonding aluminium wirecheckPCB Bonding gold wireBonding gold wirecheckPCB BGABGAcheckPCB Flex-/Rigid-FlexFlex-/Rigid-Flex PCB PressfitPressfitcheckPCB PCI contactsPCI contacts PCB sliding contactSliding contact PCB surface thicknessThickness3-8µm Ni
0.05-0.15µm Pd
0.05-0.1µm Au
PCB shelf lifeShelf lifeca. 12 monthsPCB Reflow CyclesReflow Cycles-
SurfaceGalvanic softgoldPCB RoHS-compliantRoHS-compliantcheckPCB solderingSolderingcheckPCB Bonding aluminium wireBonding aluminium wire PCB Bonding gold wireBonding gold wirecheckPCB BGABGA PCB Flex-/Rigid-FlexFlex-/Rigid-Flex PCB PressfitPressfit PCB PCI contactsPCI contacts PCB sliding contactSliding contact PCB surface thicknessThickness4 - 6µm Ni
>1µm Au
PCB shelf lifeShelf lifeca. 12 monthsPCB Reflow CyclesReflow Cycles-
SurfaceGalvanic hardgoldPCB RoHS-compliantRoHS-compliantcheckPCB solderingSoldering PCB Bonding aluminium wireBonding aluminium wire PCB Bonding gold wireBonding gold wire PCB BGABGA PCB Flex-/Rigid-FlexFlex-/Rigid-Flex PCB PressfitPressfit PCB PCI contactsPCI contactscheckPCB sliding contactSliding contactcheckPCB surface thicknessThickness4 - 6µm Ni
0.1 - 2µm* Au
PCB shelf lifeShelf lifeca. 12 months
on request
PCB Reflow CyclesReflow Cycles-

Solder-stop

Type Coating thickness
TypeOn the PCB Coating thickness > 10µm < 25µm
TypeOn the conductor edgeCoating thickness> 5µm < 25µm

Dielectric strength min. 500V DC.

Delivery quantity

Type Tolerance
TypeExcess or short delivery of up toTolerance10%